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AMS Performance released their ECU tuning for the updated E63 AMG. The new 4Matic all wheel drive E63 AMG's come with more aggressive software from the factory and it shows with Mercedes underrating the car. The stock output at the crank as measured by AMS shows 619 horsepower for the E63 AMG S and 598 horsepower for the standard E63 AMG. That certainly explains why the 4600+ pound E63 AMG S is able to run roughly 122 mile per hour trap speeds in the 1/4 mile.

Despite the more aggressive tuning from AMG there is still plenty of power and torque left on the table. There are torque limits built into the ECU by AMG in order to protect the 4Matic drivetrain that have stumped tuners but AMS seems to have found their way around these limits. The result is an increase in horsepower to 700 at the crank and 830 pound-feet of torque for the E63 AMG S and standard E63.

Both cars hit the same tuned figures as they should showing the differences in the models are artificially limited by software. The only reason to get the AMG S is if one is interested in preserving their warranty and not tuning the car. If you're reading this site that is not you so buy the standard E63 AMG and pocket the change.

The difference in horsepower between the 2014 E63 AMG 4Matic and E63 AMG S 4Matic is 21 horsepower. Not much, right? Well, the torque figure is where the difference really lies as the S has an additional whopping 89 lb-ft of torque. There is a big difference in the mapping of both cars so Mercedes is not lying about the advantage of the S model.

AMS Performance released their ECU tuning for the updated E63 AMG. The new 4Matic all wheel drive E63 AMG's come with more aggressive software from the factory and it shows with Mercedes underrating the car. The stock output at the crank as measured by AMS shows 619 horsepower for the E63 AMG S and 598 horsepower for the standard E63 AMG. That certainly explains why the 4600+ pound E63 AMG S is able to run roughly 122 mile per hour trap speeds in the 1/4 mile.

Despite the more aggressive tuning from AMG there is still plenty of power and torque left on the table. There are torque limits built into the ECU by AMG in order to protect the 4Matic drivetrain that have stumped tuners but AMS seems to have found their way around these limits. The result is an increase in horsepower to 700 at the crank and 830 pound-feet of torque for the E63 AMG S and standard E63.

Both cars hit the same tuned figures as they should showing the differences in the models are artificially limited by software. The only reason to get the AMG S is if one is interested in preserving their warranty and not tuning the car. If you're reading this site that is not you so buy the standard E63 AMG and pocket the change.

The difference in horsepower between the 2014 E63 AMG 4Matic and E63 AMG S 4Matic is 21 horsepower. Not much, right? Well, the torque figure is where the difference really lies as the S has an additional whopping 89 lb-ft of torque. There is a big difference in the mapping of both cars so Mercedes is not lying about the advantage of the S model.

Here is a dyno from a S model we did a tune on followed by some comments from the owner of the car:

Got my car tuned, by the best in biz.

Car is a beast

541 awhp/579 awtq pre tune

603 awhp/717 awtq post tune

This was done on an AWD dyno so comparing numbers to the earlier RWD models/my '13......these numbers are pretty damn good! Alpha/AMS have this same tune in their shop 2014 E63 and its been running like a champ.

This was done on an AWD dyno so comparing numbers to the earlier RWD models/my '13......these numbers are pretty damn good! Alpha/AMS have this same tune in their shop 2014 E63 and its been running like a champ.

Most definitely. Trying to see if I can find info about other "S" package enhancements but no luck yet.

I do know that if you care about that sort of thing, you cannot order ceramic brakes on a non-S, nor carbon interior trim. Both are silly limitations. I guess I wish they would have kept it as the Performance package, seems much less contrived. Either way, the AMS tune seems to be the way to go here.

Most definitely. Trying to see if I can find info about other "S" package enhancements but no luck yet.

I do know that if you care about that sort of thing, you cannot order ceramic brakes on a non-S, nor carbon interior trim. Both are silly limitations. I guess I wish they would have kept it as the Performance package, seems much less contrived. Either way, the AMS tune seems to be the way to go here.

They probably force those restrictions to make the S more attractive. It makes the standard E63 more attractive to me though.